Valmiki Ramayana Sundara Kanda Sarga 58 Shloka 157
Original Shlokaदहता च मया लङ्कां दग्धा सीता न संशयः।।5.58.157।। रामस्य हि महत्कार्यं मयेदं वितथीकृतम्।
1 source checked for this shloka
लङ्काम् Lanka, दहता burnt, मया by me, सीता Sita, दग्धा has burnt, संशयः doubt, न not, मया to me, रामस्य of Rama, इदम् this, महत् great, कार्यम् purpose, वितथीकृतम् has been spoilt.
"Lanka has been burnt by me and Sita might have also been burnt. There is no doubt. The great purpose of Rama has been spoilt by me'.